Goodyear Eagle SP ALL Seasons 285/40 R20

Goodyear Eagle SP ALL Seasons is a summer tyre made in total of 6 sizes, ranging from R18 to R18 - this particular dimension is R20, which means it fits to a 20 inch/508mm diameter wheel. 285/40 R20 is 30mm wider than the narrowest dimension (255) and 0mm narrower than the widest one (285). This tyre profile of 40 means the sidewall height of the tyre is 40% of the tyre width (285mm), which results in 114mm sidewall height.